Valve.



PATENTBD JUNE 21, '1904.

F. STAHL. VALVE.

ArPLIoATloN FILED nov. 6, 190s.

2 SHEETS-SHEET 1.

HO MODEL.

,m im Hw/ w: \\|l|\ atten/wup No. 768,123. y l PATBNTED JUNE 21, 1904.F. STAHL.

VALVE.

ArPLxoATIoN FILED Nov. s. moa. no Holm.. 2 uurs-sum1* s.

. an aperture 2O at its lower end.

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STATES FRANK STAHL,- OF VVYNDMOOR, PENNSYLVANIA, ASSIGNOR TO NELSONVALVE COMPANY, A CORPORATION OF NEW JERSEY.

VALVE.

SPECIFICATION forming part kof Letters Patent No. 763,123, dated June21, 1904.

Application iiled November 5, 1903. Serial No. 179,912. (No model.)

To /LZZ w/wm it may concern;

Be it known that I, FRANK STAHL, a citizen of the United States,residing at VVyndmoor, in the county of Montgomery, State ofPennsylvania, have invented a new and useful Improvement in Valves, ofwhich the following is a specification.

My invention relates to valves, and particularly to such as are usedbetween an air-com pressor and a storage-reservoir.

It consists of means for opening the valve to any predetermined extentand for setting the same to prevent its further opening.

It also consists of means by which the pressure in the reservoir may beexhausted when the valve is closed.

It further consists of Vnovel details of construction, all as will behereinafter fully set forth, and particularly pointed out in the claims.

Figure 1 represents an end elevation of a gate-valve embodying myinvention. Figs. 2 and 3 represent, respectively, transverse andlongitudinal vertical sections of the same.

Similar numerals of reference indicate corresponding parts in thefigures. Y

Referring tothe drawings, 1 designates a casing provided with avalve-seat 2 and with apertures 3 and 4, threaded for connection withsuitable pipes. '(Not shown-.l Above the main chamber 5 of the valve isan auxiliary chamber 6, closed by a bonnet 7. The bonnet7 is threaded at8 to receive a threaded sleeve 9, on which is a jam-nut 10. A washer 11may be provided between the jam-nut 10 and the bonnet 7. /Vithin thesleeve 9 is a longitudinally-movable valve-stem 12, provided at itslower end with a head 13. adapted to loosely engage a pair of disks 1415, which form a valve and are seated in the portions 2. In the disk 14is a central aperture 16, the function of which will hereinafter appear.Secured on the valve-stem 12 above the head 13 is a metal washer 17,above which is a packing-washer 18. The upper portion of the stem 12 hasa longitudinal bore 19, having At the upper end of the stem 12 is a fork21, adapted to receive a lever 22, which may be connected by a link 23with a lug 24 at the side of the casing 1. At the upper part of the stem12 is inscribed a plurality of characters 25, the function of which willhereinafter appear.

The operation is as follows: Assuming' that the valve is assembled asshown and has its opening 3 connected to a compressor or the like andits opening 4 connected to a reservoir for compressed air or otheriiuid, (neither of which are shown,) the disk 14, containing the opening16, will be on the side toward the reservoir. When the sleeve 9 isscrewed down to the position shown in the drawings, the valve may beraised so as to open to onehalf its capacity. This will be indicated bythe line adjacent the character 1/2 onv the stem 12, which line willcoincide with the upper end of the threaded sleeve 9. Itis evident thatby loosening the jam-nut 10 the sleeve 9 may be partially unscrewed outof the bonnet 7, so that the valve may be opened to a greater extent. Bysuiliciently nnscrewing the sleeve the line adjacent the word Open willcoincide with the upper end of the sleeve 9 when the valve is entirelyclear of the chamber 5 in the casing 1. When the valve is closed, asshown in dotted lines, Figs. 1 and 3, air may freely exhaust from thereservoir through the aperture 16 in the disk 14 between the disks 14 15into the chamber 6 and thence through thevaperture 2O and bore 19 to theatmosphere. This relieves all pressure in the reservoir as soon as thevalve is closed and the requirement for compressed fluid ceases. Thevalve may be held tightly to its seat by a weight at the end of thelever 85 22 or in any other well-known manner. It is obvious that whenthe valve is wholly or partially open-say as shown in full lines in thedrawings-the aperture 16 has no communication with the lower portion ofthe casing 1, in addition to which the aperture 2O is sealed from anycommunication with the chamber 6 by reason of its having been drawn upin the sleeve 9 and, further, by reason of the washer 18, which ispressed between the metal washer 17 and the foot of the sleeve, so thatno escape of fluid is possible. By means of the washer 11, which ispacked between the jam-nut l0 and the bonnet 7, any escape of air inthis direction from the Chamber 6 will be prevented.

Having thus described my invention, What l claim as new, and desire tosecure by Letters Patent, isw

l. A gate-valve Comprising a easing, a pair of valve-disks one of whichis apertured, a stem by which said disks are moved and a passage in saidstem Communicating with said aperture when said disks are lowered,whereby exhaust is permitted through one end of Asaid easing,

2. A gate-valve comprising a easing, a plusg rality of chambers in saideasing, disks, one of which is apertured, forming a valve, a stem bywhich said disks are moved whereby valve is closed,

FRANK STAHL. /Vitnesses:

RUSSELL BONNELL, J. JUDsoN CURTIS, J r.

